Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1997 Geo Prizm Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Circuit Tests: Notes
NOTE:
Geo uses two types of diagnostic connectors. Duty check Data Link Connector (duty check DLC) and OBD-II Data Link Connector (DLC). In this article, duty check DLC refers to 23-pin diagnostic connector. Connector is located next to left strut tower in engine compartment. DLC refers to 16-pin diagnostic connector located under instrument panel used for scan tool hook-up.
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.